Key Specifications, Waveguide Size 1: WR-90, Flange Size 1: UG-39/U, Waveguide Size 2: WR-90, Flange Size 2: UG-39/U, Length: 9 inches, Frequency, Min: 8.2 GHz, Frequency, Max: 12.4 GHz. WR-90 Commercial Grade Straight Waveguide Section 9 Inch Length with UG-39/U Flange Operating from 8.2 GHz to 12.4 GHz. PE-W90S001-9 WR-90 waveguide section is straight and is 9 inches long. This 9 inch WR-90 straight waveguide section from Pasternack is commercial grade and has a UG-39/U flange. Our straight WR-90 waveguide section with UG-39/U flange has a minimum frequency of 8.2 GHz and a maximum frequency of 12.4 GHz. WR-90 waveguide section PE-W90S001-9 is part of over 40,000 RF, microwave and millimeter wave components. Our commercial grade WR-90 straight waveguide section will ship same the day as it is purchased worldwide as with our other RF parts.